Biasi Riva Compact combi boiler

[Jacko]

Hello All
The pump proving switch on the above named boiler does not retract.
As soon as the boiler is pressurised the pin comes out even with no power to the boiler.
The pin is not warped, the diaphragm has been replaced and there is no debri behind the diaphragm.
What causes the pump proving switch to be fully out with no demand on?

 

[Riley]

Are you gas safe

 

[Jacko]

Yes. 539230

 

[Riley]

@ShaunCorbs sorry bud have to ask we have a strict non diy gas policy. Shaun should be able to sort you

 

[Jacko]

yeah no worries mate, totally understand

 

[Riley]

We take discussion like this off open forum to avoid prying eyes. Stick around there’s some really knowledgeable guys

 

[ShaunCorbs]

hes gas safe reg help away will sort it out

 

[AMGasServices]

Have you tested the micro switch withyou multi meter ?

 

[Jacko]

Have you tested the micro switch withyou multi meter ?

The flow switch works fine. Once reset I can create a demand and manually engage the switch and the boiler fires up, when I then release the switch the burners go off. The pin on the manifold stays out on goes down when the boiler is depressurised.

 

[AMGasServices]

Is it a single board or twin board ?